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https://issues.apache.org/jira/browse/HADOOP-4851?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen O'Malley resolved HADOOP-4851.
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    Resolution: Won't Fix

I don't think this is a good idea. Having implemented on top of the JAAS stuff, 
the impedance mismatch is pretty annoying. Can I close this as won't fix?

> Change filesystem permissions to use JAAS rather than UGI
> ---------------------------------------------------------
>
>                 Key: HADOOP-4851
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4851
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.20.0
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>
> Hadoop embraced JAAS via HADOOP-4348.
> We need to fix HDFS to use JAAS concepts such as Subject, Principal, 
> Permission etc. rather than UserGroupInformation for file-system permissions.

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